4. Bit-defender Antivirus : This is the stripped-down version of the famous Bit-defender paid antivirus. Although the UI and detection is quite good, most of the Windows users chose either Avira, Avast or AVG for some reasons.

7. Microsoft Security Essentials : This all new antivirus solution from Microsoft has been rated as one of the best of the antivirus solutions in a recent survey. Although the program is still in Beat stage, many Windows users are happy with it.